1-cell Li-Ion Charger w/ 1-A FET, AC Present and Charge Enable 10-VSON -40 to 85# BQ24080DRCR Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The BQ24080DRCR is a highly integrated single-chip Li-ion and Li-polymer battery management IC designed for space-constrained portable applications. Its primary use cases include:
Portable Medical Devices
- Wearable health monitors requiring continuous operation
- Portable diagnostic equipment with frequent recharge cycles
- Emergency medical devices needing reliable battery backup
- Insulin pumps and continuous glucose monitoring systems
Consumer Electronics
- Smartphones and tablets requiring fast charging capabilities
- Wireless earbuds and hearables with compact form factors
- Smart watches and fitness trackers with daily charging requirements
- Portable gaming devices with high power consumption
Industrial Applications
- Handheld scanners and data collection terminals
- Portable test and measurement equipment
- IoT edge devices with limited physical space
- Remote monitoring sensors with extended battery life requirements
### Industry Applications
- Healthcare : Medical monitoring equipment, portable diagnostic tools
- Consumer Electronics : Mobile devices, wearable technology
- Industrial Automation : Portable data terminals, handheld instruments
- Telecommunications : Mobile routers, portable communication devices
- Automotive : Aftermarket car accessories, portable navigation systems
### Practical Advantages
Key Benefits:
- High Integration : Combines power path management, charging circuitry, and system protection in a single 3mm × 3mm package
- Fast Charging : Supports up to 1.5A charge current with thermal regulation
- Power Path Management : Enables simultaneous charging and system operation
- Small Footprint : QFN package ideal for space-constrained designs
- Thermal Protection : Comprehensive thermal regulation prevents overheating
Limitations:
- Current Limitation : Maximum 1.5A charge current may be insufficient for high-capacity batteries
- Input Voltage Range : Limited to 4.35V to 6.5V input range
- Temperature Monitoring : Requires external NTC thermistor for optimal thermal management
- Package Size : Small QFN package may present soldering challenges in manual assembly
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Inadequate Thermal Management
- Problem : Overheating during high-current charging
- Solution : Implement proper thermal vias under the package and ensure adequate copper pour
Pitfall 2: Input Voltage Transients
- Problem : Damage from voltage spikes on USB input
- Solution : Include TVS diodes and input capacitors close to the VIN pin
Pitfall 3: Battery Connection Issues
- Problem : Intermittent battery detection due to poor connections
- Solution : Use robust battery connector and ensure proper mechanical retention
Pitfall 4: Charge Termination Errors
- Problem : Premature or delayed charge termination
- Solution : Proper battery sense resistor selection and calibration
### Compatibility Issues
Input Power Sources
- Compatible with standard USB ports (5V) and USB-C power delivery
- May require additional circuitry for higher voltage USB-PD implementations
- Works with most wall adapters and car chargers within specified voltage range
Battery Types
- Optimized for single-cell Li-ion and Li-polymer batteries
- Compatible with most 3.6V/3.7V lithium-based chemistries
- Requires external protection circuitry for high-risk applications
System Integration
- Interfaces well with most microcontrollers through status pins
- Compatible with standard I²C communication for advanced control
- May require level shifting for 1.8V logic systems
### PCB Layout Recommendations
Power Path Layout
- Place input capacitors (C1, C2) within 2mm of VIN and GND pins
- Route battery connections with wide traces (minimum 20 mil
